算法模板——并查集

 1 var
 2    i,j,k,l,m,n:longint;
 3    c:array[0..100000] of longint;
 4 function getfat(x:longint):longint;inline;
 5          begin
 6               if c[x]<>x then c[x]:=getfat(c[x]);   //亮点在这里么么哒
 7               exit(c[x]);
 8          end;
 9 begin
10      readln(n);
11      for i:=1 to n do c[i]:=i;
12      while true do
13            begin
14                 read(i);if (i<1) or (i>2) then halt;
15                 readln(j,k);
16                 case i of
17                      1:c[getfat(j)]:=getfat(k);    //合并
18                      2:if getfat(j)=getfat(k) then writeln(‘Together!‘) else writeln(‘Not together!‘); //判断是否已合并
19                 end;
20            end;
21 end.
22